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    อุปกรณ์วัด Control System (Industrial Grade pH Controller with Single Set point and Proportional Dosage)

    HI 9910

    Industrial Grade pH Controller with Single Set point and Proportional Dosage

    HI 9910 is a pH controller with a single set point for proportional dosage of acid or alkaline solutions. Any pH electrode ending in a BNC connector can be directly attached to the controller. The proportional control can be fine tuned through two dials on the front panel. The time cycle is adjustable from 0 to 90 seconds and the proportional band from 0.0 to 2.0 pH. Coarse and fine as well as offset and slope trimmers make accurate setting and calibration easy and convenient. A pump or electrovalve can be wired directly to the controller and be powered through the terminals.

    The HI 9910 also provides for an alarm relay. The alarm is activated when the measurements stray away from the set point by a predetermined value in the 0.5 to 2.5 pH range. A maximum dosing time from 1 to 10 minutes can also be set, after which the alarm is activated to warn of an abnormality. The alarm can be configured in either normally-closed or normally-opened state. HI 9910 also provides an isolated output signal which is user selectable between 0-20 or 4-20 mA. A dial on the front panel renders manual temperature compensation fast and easy.

    For automatic temperature compensation, hook up a three wire Pt100 to the controller. To speed up wiring, the HI 9910 comes with extractable terminal modules. Once wired up, the compartment containing the connections is protected behind a fire-retardant ABS panel. Several LED’s show whether the set point or alarm relays are activated from a distance.


    Range  0.00 to 14.00 pH
    Resolution  0.01 pH
    Accuracy @ 20°C  ±0.02 pH
    Calibration  through “OFFSET” and “SLOPE” trimmers (max. ±1.5 pH for offset and 80% to 110% for slope)
    Compensation  automatic from 0 to 50°C with Pt100 probe or manual from -10 to 80°C
    Setpoint  from 0.00 to 14.00 pH with “COARSE” and “FINE” trimmers with “ACID” or “ALK” (alkaline) selection
    mA Output  user selectable 0 to 20 mA or 4 to 20 mA over the 0-14 pH range with isolated output
    Control  pH is user adjustable from 0.0 to 2.0 and time cycle from 0 to 90 seconds
    Alarm Contact  terminals can be configured as normally open or normally closed (isolated output max. 2A, max. 240V, resistive load, 1,000,000 strokes). The alarm is activated if pH varies by more than user selectable interval (0 to 2 pH) from set point or due to overdosage
    Dosing Terminals  relay terminals (115 to 240V, max.2A,1,000,000 strokes) are activated when pH exceeds the set point with “ACID” dosage or falls below the set point with “ALK” selection (alkaline dosage)
    Power Supply  ±10% 115 VAC or 230 VAC; 50/60 Hz
    Environment  -10 to 50°C (14 to 122°F); RH max 95% non-condensing
    Case Material  fiber-reinforced, self-extinguishing ABS
    Dimensions  221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
    Weight  1.6 kg (3.5 lb.)


    HI 7004L  4.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7007L  7.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7010L  10.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 8427  pH and mV Precision Simulator
    HI 931001  pH and mV Precision Simulator

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